Register Descriptions; Table 9.17 Watchdog Timer Registers - Renesas H8/3847R Series Hardware Manual

3. Register Configuration
Table 9.17 shows the register configuration of the watchdog timer.

Table 9.17 Watchdog Timer Registers

Name
Timer control/status register W
Timer counter W
Clock stop register 2
Port mode register 3
9.6.2

Register Descriptions

1. Timer Control/Status Register W (TCSRW)
Bit 7
B6WI
Initial value 1
Read/Write R
Note: * Write is permitted only under certain conditions, which are given in the descriptions of
the individual bits.
TCSRW is an 8-bit read/write register that controls write access to TCW and TCSRW itself,
controls watchdog timer operations, and indicates operating status.
Bit 7: Bit 6 write inhibit (B6WI)
Bit 7 controls the writing of data to bit 6 in TCSRW.
Bit 7
B6WI Description
0 Bit 6 is write-enabled
1 Bit 6 is write-protected
This bit is always read as 1. Data written to this bit is not stored.
Abbr.
TCSRW
TCW
CKSTP2
PMR3
6 5
TCWE B4WI TCSRWE
0 1
R/(W)* R R/(W)*
R/W Initial Value
R/W H'AA
R/W H'00
R/W H'FF
R/W H'00
4 3 2
B2WI WDON
0 1 0
R R/(W)*
Rev. 6.00 Aug 04, 2006 page 313 of 680
Section 9 Timers
Address
H'FFB2
H'FFB3
H'FFFB
H'FFCA
1 0
B0WI WRST
1 0
R R/(W)*
(initial value)
REJ09B0145-0600